Device for setting expansion screw bases in holes



F. M. OLIN 2,519,693 DEVICE FOR SETT c; EXPA on SCREW BASES HOL Filed April 12, 1947 Aug. 22, 1950 WW, I

FRANK M. Ouu,

I) MQM' Patented Aug. 22, 1950 DEVI-CE FOR sperms. EXPANSION SCREW isAsEs IN nomzs Frank M. Olin, Indianapelis, Ind. Apbii'cation April 1947, Serial No..741,13

. 2 Claims.

This invention relates to a device for setting expansion screw bases in holes. A primary ob ject of the invention is to provide such a device wherein no hammering on the base or any part thereof is required and wherein a screw may be employed to effect the setting of the base, this screw being apart from the screw to be used normally with the base,

A further important object of the invention is to provide a structure for the purposes above indicated wherein the setting action is accomplished without the turning of a screw member in the threads of the base structure. A still further important object of the invention is to provide such a structure wherein positive means are incorporated to prevent any possibility of the turning of the screw threaded member while the setting operation is being accomplished. In this regard, my invention contemplates the use of a screw which may be used over and over again to initially engage in the screw threaded member of the base asa means of interconnecting that memberwit-h the Screw. This screw member may be of varying lengths depending upon the position within a hole where the screw base is to be set.

These and many other objects and advantages of the invention including the unique and simplified parts and assembly thereof forming the structure, will become apparent to those versed in the art in the following description of one particular form of the invention as illustrated in the accompanying drawing, in which Fig. l is a view in outside end elevation;

Fig. 2, a view in opposite end elevation;

Fig. 3, a view in side elevation in position ready to set a screw base within a hole in a wall shown in section;

Fig. 4, a View in section on the line 4-4 in Fig. 1;

Fig.5, a view in transverse section on the line -5 in Fig. 4;

Fig. 6, a view in top plan, and

Fig. '7, a view in central vertical section through the expansion screw base after being set.

Referring to the drawing in which like characters of reference indicate like parts throughout the several views, I form a head If] having an outer end portion I I externally threaded. On the other end of the head [0 is a nipple l2 having an external diameter which will permit it to be inserted freely within a hole l3 in a wall l4 (the term wall intended to be sufficiently inclusive to include a floor, ceiling or the like), within which hole l3 the base of the expansion screw 2 embodying the usual lead sleeve [5 and tapered nut I6 is inserted.

In the form herein shown, the central portion of thebody ll] is made to be hexagonal in shape so as to permit the holding of the body by any suitable means such as a wrench, against turning. -Normally the body H3 may be held against turning by the simple expedient of employing an elongated pin I"! inserted in or fixed to the body it]. The pin ll is shown as extending from the body it substantially at right angles to the axis of the body.

7 On the screw threaded portion is carried a nutl3 free to be revolved therearound as a means of causing it to travel longitudinally of that portion II. This nut l8 may have any desirable external shape, herein shown as being hexagonal to permit the use of a wrench thereon if desirable. However, for quick manipulation of the nut i8, normally pins l9, herein shown as three in number, are fixed to the nut [8 to extend radially therefrom. These pins may be secured permanently to the nut H3 or may be removably received thereby such as by inserting the inner end of the pin IS in each instance within a socket 20 provided in the nut. A cap 2| is provided to have an internal bore 22 suffioiently great in diameter as to permit the cap 2! to be freely received over the outer end of the body portion l l. The body portion 1 l is provided with a keyway 23 extending longitudinally across the threaded portion to receive a pin 24 slidingly therein, this pin 24 being fixed to the cap 2! near its mouth to extend radially inwardly from the wall of the cap.

A screw 25 is selected to have sufficient length to extend through the end of the cap 2! rotatably throughout the body it and to extend on inside of the sleeve l5 to screw tmeadedly engage with the nut l6, Fig. 4. As indicated, the underside of the head 26 of this screw 25 normally bears against the outer end face of the cap 2|.

In operation, the members [5 and it are inserted within the hole l3 in the relation indicated in Fig. 4. Then the body IE! is brought up to have the nipple I2 seated against the outer end of the sleeve l5. The length of this nipple l2 may be varied for different jobs depending upon the depth within the hole i3 at which the sleeve is desired to be limited. In any event, the end of the nipple l2 abuts the outer end of the sleeve 95. Normally the sleeve 55 and nut [6 will be assembled in the relation shown in Fig. i externally of the hole It? to have the sleeve l5 abut the end of the nipple l2 with the nut l6 entered within the sleeve [5 without a tendency to expand the sleeve. That is the screw 25 by being threaded in the nut 16 ties the sleeve l5 and nut It to the body l0, whereby by using the handle or pin [1, the sleeve I5 and nut l6 are inserted in the hole [3. Here the outer end of the nut E6 is shown in the drawing as abutting the bottom of the hole 13. This is not necessary since the sleeve l5 can be pulled outwardly toward the face of the wall It.

The nut I8 is initially positioned on the body portion l I adjacent the inner ends of the threads. By revolving the nut [8 to cause it to travel outwardly the cap 2| is pushed outwardly and in turn pulls the screw 25 outwardly to carry the nut l6 into the sleeve to achieve the resultant effect illustrated in Fig. 7 where the sleeve I5 has been expanded, possibly in an exaggerated form, and is held in that position by the presence of the nut l6 therein. Then the nut I8 is reversed in travel to allow the cap 2| to be positioned in- Wardly away from the screw head 26, whereupon this screw 26 may be turned to Withdraw it from the nut 15. It is to be noted that this screw 25 is a part'of the tool itself and is not intended to be used in permanent connections with the nut I6 after the setting of the sleeve I5. Further it is important to note that at no time is there any tendency to turn the screw 25 by turning the nut 18 by reason of the fact that the cap 21 is inserted between that nut and the screw. Thus there is. no tendency for the screw threads to be worn or cut within the nut 16 as has heretofore been the case when the turning of the screw 25 was utilized as the means for drawing the nut I6 within the sleeve l5. Since the nut I6 is necessarily made to be thin walled the internal threads of that nut are quite easily damaged. Such damage obviously must not be permitted, otherwise the retaining qualities of the nut it for permanent mounting purposes are lost.

While I have herein shown and described my invention in the one particular form, it is obvious that structural changes may be made such for example, as in the shape in the holding pin 11, the shape of the nut l8, and in the various proportions of the parts all without departing from the spirit of the invention, and I therefore do not desire to be limited to that precise form beyond the limitations which may be imposed by the following claims.

I claim:

1. The combination of a body having an externally threaded rear end portion and an axial bore therethrough; a nut screw threadedly engaged around said portion; a cap loosely fitted over said portion to extend thereover and abut said nut; means holding said cap against revolution relative to said body upon turning of said nut thereagainst; and a screw threaded member carried by said cap and extending freely through said bore and past the front end portion thereof.

2. The combination of a body having an externally threaded rear end portion and an axial bore therethrough; a niit screw threadedly engaged around said portion; a cap loosely fitted over said portion to extend thereover and abut said nut; means holding said cap against revolution relative to said body upon turning of said nut thereagainst; and a, screw threaded member carried by said cap and extending freely through said bore and past the front end portion thereof; said means consisting of a keyway across said threaded portion of the body, and a pin fixed to said cap entered in said keyway.

FRANK M. OLIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

